everything that president obama was not last week was on display in joe biden's attacks tonight. biden interjected. he interrupted paul ryan several times appearing to knock the congressman off his message. you'll see this in this exchange we're about to show you. they're talking about republican proposals to cut spending while refusing to raise new revenue. the vice president saying that numbers do not add up and then jumping in as paul ryan tried to respond. >> it's not mathematically possible. >> it is mathematically possible. it's been done before. it's precisely what we're proposing. >> it has never been done. >> it's been done a couple of times. >> it has never been done before. >> ronald reagan and jack kennedy -- >> now you're jack kennedy. >> the vice president almost got dismissive when he tried to question the administration's business in afghanistan. >> at times joe biden used answers like marlakey over answers paul ryan gave. the romney/ryan ticket has been saying the united states has been pulling too many troops out of afghanistan leave doing small of force to defe